Great Lakes Forecast
Issued by NWS
Issued by NWS
824 FZUS63 KMQT 271341 GLFLS Open Lake Forecast for Lake Superior National Weather Service Marquette MI 941 AM EDT Thu Jun 27 2024 For waters beyond 5 nautical miles of shore on Lake Superior. Waves are the significant wave height - the average of the highest 1/3 of the wave spectrum. Occasional wave height is the average of the highest 1/10 of the wave spectrum. .SYNOPSIS...A 30.0 inch high pressure ridge over the Upper Great Lakes today will shift into Lower Great Lakes tonight and into New England on Friday in response to a 29.5 inch low pressure approaching from the Northern Plains. This low will then weaken 29.6 inches as it tracks across Lake Superior Friday night and Saturday morning. As the low heads toward southern Quebec on Saturday, 30.2 inch high pressure will build over the Northern Plains. The high will then build to 30.3 inches as it shifts east, reaching the Western Great Lakes Sunday evening and the Central Great Lakes on Monday. LSZ162-272145- Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM- 941 AM EDT Thu Jun 27 2024 /841 AM CDT Thu Jun 27 2024/ .REST OF TODAY...Southwest winds 5 to 15 knots backing south late. Waves calm to 2 feet. .TONIGHT...Southeast winds 5 to 15 knots backing east after midnight, then increasing to 10 to 20 knots late. A slight chance of showers through midnight, then showers likely and a slight chance of thunderstorms after midnight. Waves calm to 2 feet. .FRIDAY...South winds 10 to 20 knots veering southwest late. Showers and a chance of thunderstorms. Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet. .FRIDAY NIGHT...South winds 10 to 20 knots veering west after midnight. Showers likely through midnight. A chance of thunderstorms. A slight chance of showers after midnight. Waves subsiding to calm to 2 feet. .SATURDAY...West winds 15 to 25 knots veering northwest by mid afternoon. A chance of showers. Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet. .SATURDAY NIGHT...North winds 10 to 20 knots becoming northwest 5 to 15 knots after midnight. Waves subsiding to calm to 2 feet. .SUNDAY...Southwest winds 5 to 15 knots backing south. Waves calm to 2 feet. .MONDAY...East winds 10 to 20 knots becoming southeast 15 to 25 knots. A chance of showers, then showers. Waves building to 2 to 4 feet. $$ LSZ263-272145- Lake Superior from Saxon Harbor WI to Upper Entrance to Portage Canal MI 5NM off shore to the US/Canadian border including Isle Royale National Park- 941 AM EDT Thu Jun 27 2024 .REST OF TODAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet building to 1 to 3 feet. .TONIGHT...South winds 5 to 15 knots backing southeast after midnight, then veering south late. A chance of showers after midnight. Waves subsiding to calm to 2 feet. .FRIDAY...South winds 10 to 20 knots diminishing to 5 to 15 knots late. Showers and a slight chance of thunderstorms. Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet. .FRIDAY NIGHT...South winds 5 to 15 knots veering west after midnight. Showers through midnight. A chance of thunderstorms. A chance of showers after midnight. Waves subsiding to calm to 2 feet. .SATURDAY...West winds 15 to 25 knots veering northwest by mid afternoon. A chance of showers. Waves building to 2 to 4 feet. .SATURDAY NIGHT...North winds 10 to 20 knots becoming northwest 5 to 15 knots after midnight. Waves subsiding to calm to 2 feet. .SUNDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet. .MONDAY...South winds 5 to 15 knots becoming southeast 10 to 20 knots. Showers. Waves building to 2 to 4 feet. $$ LSZ264-272145- Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border- 941 AM EDT Thu Jun 27 2024 .REST OF TODAY...West winds 5 to 15 knots backing southwest in the afternoon. Waves calm to 2 feet. .TONIGHT...South winds 5 to 15 knots. A slight chance of showers after midnight. Waves building to 1 to 3 feet. .FRIDAY...South winds 10 to 20 knots becoming southeast 15 to 25 knots in the afternoon, then veering south late. Showers. A slight chance of thunderstorms by mid afternoon. Waves building to 3 to 6 feet occasionally to 8 feet. .FRIDAY NIGHT...South winds 5 to 15 knots backing north after midnight. Showers through midnight. A chance of thunderstorms. A chance of showers after midnight. Waves subsiding to 1 to 3 feet. .SATURDAY...Northwest winds 15 to 25 knots. A chance of showers. Waves building to 3 to 5 feet occasionally to 7 feet. .SATURDAY NIGHT...North winds 10 to 20 knots becoming northwest 5 to 15 knots after midnight. Waves subsiding to 1 to 3 feet. .SUNDAY...West winds 5 to 15 knots backing southwest. Waves subsiding to calm to 2 feet. .MONDAY...Southeast winds 5 to 15 knots increasing to 15 to 25 knots. Showers likely. Waves building to 3 to 5 feet occasionally to 7 feet. $$ LSZ265-272145- Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore- 941 AM EDT Thu Jun 27 2024 .REST OF TODAY...West winds 10 to 20 knots backing south late. Waves calm to 2 feet. .TONIGHT...Southeast winds 10 to 20 knots veering south after midnight. Waves calm to 2 feet. .FRIDAY...South winds 10 to 20 knots becoming southeast 15 to 25 knots in the afternoon, then becoming south 10 to 20 knots late. Showers likely. A slight chance of thunderstorms by mid afternoon. Waves building to 2 to 4 feet. .FRIDAY NIGHT...South winds 10 to 20 knots veering southwest after midnight. Showers through midnight. A chance of thunderstorms. A chance of showers after midnight. Waves subsiding to calm to 2 feet. .SATURDAY...West winds 10 to 20 knots becoming northwest 20 to 30 knots by mid afternoon. A chance of showers. Waves building to 1 to 3 feet. .SATURDAY NIGHT...Northwest winds 15 to 25 knots. Waves 1 to 3 feet. .SUNDAY...Northwest winds 10 to 20 knots becoming west 5 to 15 knots. Waves subsiding to calm to 2 feet. .MONDAY...Southeast winds 10 to 20 knots becoming south 15 to 25 knots. Showers likely. Waves building to 1 to 3 feet. $$ LSZ266-272145- Lake Superior East of a line from Manitou Island to Marquette MI and West of a line from Grand Marais MI to the US/Canadian Border Beyond 5NM from shore- 941 AM EDT Thu Jun 27 2024 .REST OF TODAY...West winds 10 to 20 knots diminishing to 5 to 15 knots in the afternoon, then backing southwest late. Waves calm to 2 feet. .TONIGHT...South winds 5 to 15 knots increasing to 10 to 20 knots after midnight. Waves building to 1 to 3 feet. .FRIDAY...South winds 15 to 25 knots. A chance of showers through early afternoon, then showers and a slight chance of thunderstorms by mid afternoon. Waves building to 3 to 6 feet occasionally to 8 feet. .FRIDAY NIGHT...South winds 10 to 20 knots. Showers and a chance of thunderstorms. Waves subsiding to 1 to 3 feet. .SATURDAY...West winds 10 to 20 knots becoming northwest 15 to 25 knots by mid afternoon. A chance of showers. Waves building to 3 to 5 feet occasionally to 7 feet. .SATURDAY NIGHT...Northwest winds 15 to 25 knots. Waves building to 3 to 6 feet occasionally to 8 feet. .SUNDAY...Northwest winds 10 to 20 knots becoming west 5 to 15 knots. Waves subsiding to calm to 2 feet. .MONDAY...Southeast winds 10 to 20 knots becoming south 15 to 25 knots. A chance of showers. Waves building to 3 to 5 feet occasionally to 7 feet. $$ LSZ267-272145- Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border- 941 AM EDT Thu Jun 27 2024 .REST OF TODAY...West winds 10 to 20 knots diminishing to 5 to 15 knots late. Waves 1 to 3 feet subsiding to calm to 2 feet. .TONIGHT...South winds 5 to 15 knots increasing to 10 to 20 knots late. Waves calm to 2 feet. .FRIDAY...South winds 10 to 20 knots increasing to 15 to 25 knots in the afternoon. A slight chance of showers through early afternoon, then showers likely by mid afternoon. Waves building to 2 to 4 feet. .FRIDAY NIGHT...South winds 15 to 25 knots diminishing to 10 to 20 knots after midnight. Showers and a chance of thunderstorms. Waves subsiding to 1 to 3 feet. .SATURDAY...West winds 10 to 20 knots increasing to 15 to 25 knots by mid afternoon. A chance of showers and thunderstorms. Waves building to 2 to 4 feet. .SATURDAY NIGHT...Northwest winds 15 to 25 knots. Waves building to 3 to 6 feet occasionally to 8 feet. .SUNDAY...Northwest winds 10 to 20 knots diminishing to 5 to 15 knots. Waves subsiding to calm to 2 feet. .MONDAY...East winds 5 to 15 knots becoming southeast 10 to 20 knots. A chance of showers. Waves building to 2 to 4 feet. $$ LSZ261-272145- MAFOR 2715/ Superior West 12510 11400 11300 12310 11326 11436. Waves 2 feet or less this afternoon and tonight. Waves 1 to 2 feet building to 2 to 4 feet Friday morning. Superior North Central 13510 13410 12420. A chance of showers Friday morning. Waves 1 to 3 feet. Superior South Central 11610 11600 11300 12310 11410 12420. A chance of showers Friday morning. Waves 2 feet or less this afternoon and tonight. Waves 1 to 3 feet building to 2 to 4 feet Friday morning. Superior East 13600 11500 11400 12410 11420. Waves 1 to 3 feet. $$ LC Experimental modernized open lake forecast is available online at weather.gov/mqt/glftable Graphical marine forecasts are available online at: weather.gov/greatlakes